KKR, Blackstone Try to Finalize Joint Bid for Life Technologies

Three of the world's largest buyout firms were in talks late Tuesday to make a multibillion-dollar offer for Life Technologies Corp. ahead of a deadline for bids in what would be one of this year's largest corporate takeovers.

The buyout group, which includes Blackstone Group LP, Carlyle Group LP, KKR & Co. and Singapore's state investment company Temasek Holdings Ltd. remained in discussions late Tuesday about putting forth a...